package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.DishDto;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.exception.CustomException;
import com.itheima.reggie.mapper.CategoryMapper;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {

    @Autowired
    private DishService dishService;
    @Autowired
    private SetmealService  setmealService;


    /*
    删除分类
     */
    @Override
    public void deleteById(Long id) {
        //1.判断该分类是否关连菜品
        //如果关连 抛出关连异常
        LambdaQueryWrapper<Dish> dishLqw = new LambdaQueryWrapper<>();
        dishLqw.eq(Dish::getCategoryId,id);
        long dishCount = dishService.count(dishLqw);
        if (dishCount>0){
            throw new CustomException("当前分类已关联菜品 不允许删除");
        }
        //2.判断该分类是否关连套餐
        //如果已关联 抛出业务异常
        LambdaQueryWrapper<Setmeal> SetmealLqw = new LambdaQueryWrapper<>();
        SetmealLqw.eq(Setmeal::getCategoryId,id);
        long SetmealCount = setmealService.count(SetmealLqw);
        if (SetmealCount>0){
            throw new CustomException("当前分类已关联套餐 不允许删除");
        }
        //3.删除该分类
        removeById(id);

    }


}
